Well Hirano Aya and Yuko Goto's voices are sopranos and Chihara Minori is more Alto compared to them.
During most parts in Hare Hare Yukai, Chihara Minori is providing harmony between the 2 sopranos. Hirano Aya and Yuko Goto are the main singers while Chihara Minori enhances their voices.
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